/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors 
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.programstagefilter;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import lombok.RequiredArgsConstructor;
import org.hisp.dhis.common.AssignedUserSelectionMode;
import org.hisp.dhis.organisationunit.OrganisationUnit;
import org.hisp.dhis.organisationunit.OrganisationUnitService;
import org.hisp.dhis.program.Program;
import org.hisp.dhis.program.ProgramService;
import org.hisp.dhis.program.ProgramStage;
import org.hisp.dhis.program.ProgramStageService;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

/**
 * @author Ameen Mohamed <ameen@dhis2.org>
 */
@RequiredArgsConstructor
@Service("org.hisp.dhis.programstagefilter.EventFilterService")
@Transactional(readOnly = true)
public class DefaultEventFilterService implements EventFilterService {
  private final ProgramService programService;

  private final ProgramStageService programStageService;

  private final OrganisationUnitService organisationUnitService;

  @Override
  public List<String> validate(EventFilter eventFilter) {
    List<String> errors = new ArrayList<>();

    if (eventFilter.getProgram() == null) {
      errors.add("Program should be specified for event filters.");
    } else {
      Program pr = programService.getProgram(eventFilter.getProgram());

      if (pr == null) {
        errors.add("Program is specified but does not exist: " + eventFilter.getProgram());
      }
    }

    if (eventFilter.getProgramStage() != null) {
      ProgramStage ps = programStageService.getProgramStage(eventFilter.getProgramStage());
      if (ps == null) {
        errors.add(
            "Program stage is specified but does not exist: " + eventFilter.getProgramStage());
      }
    }

    EventQueryCriteria eventQC = eventFilter.getEventQueryCriteria();
    if (eventQC != null) {
      if (eventQC.getOrganisationUnit() != null) {
        OrganisationUnit ou =
            organisationUnitService.getOrganisationUnit(eventQC.getOrganisationUnit());
        if (ou == null) {
          errors.add("Org unit is specified but does not exist: " + eventQC.getOrganisationUnit());
        }
      }
      if (eventQC.getAssignedUserMode() != null
          && eventQC.getAssignedUsers() != null
          && !eventQC.getAssignedUsers().isEmpty()
          && !eventQC.getAssignedUserMode().equals(AssignedUserSelectionMode.PROVIDED)) {
        errors.add("Assigned User uid(s) cannot be specified if selectionMode is not PROVIDED");
      }

      if (eventQC.getEvents() != null
          && !eventQC.getEvents().isEmpty()
          && eventQC.getDataFilters() != null
          && !eventQC.getDataFilters().isEmpty()) {
        errors.add("Event UIDs and filters can not be specified at the same time");
      }

      if (eventQC.getDisplayColumnOrder() != null
          && eventQC.getDisplayColumnOrder().size() > 0
          && (new HashSet<>(eventQC.getDisplayColumnOrder())).size()
              < eventQC.getDisplayColumnOrder().size()) {
        errors.add("Event query criteria can not have duplicate column ordering fields");
      }
    }

    return errors;
  }
}
